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Setting up ExternalDNS for Services on AWS
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Setting up ExternalDNS for Services on Azure
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Setting up ExternalDNS for Services on Cloudflare
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Setting up External DNS with Contour
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Setting up ExternalDNS for CoreDNS with minikube
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Setting up ExternalDNS for Services on OpenStack Designate
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Setting up ExternalDNS for Services on DigitalOcean
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Setting up ExternalDNS for Services on DNSimple
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Setting up ExternalDNS for Dyn
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Setting up ExternalDNS for Exoscale
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Setting up ExternalDNS for ExternalName Services
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Setting up ExternalDNS for Services on Gandi
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Configuring ExternalDNS to use Gateway API Route Sources
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Setting up ExternalDNS on Google Kubernetes Engine
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Configuring ExternalDNS to use the Gloo Proxy Source
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Setting up ExternalDNS for Services on GoDaddy
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Setting up ExternalDNS for Headless Services
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Setting up ExternalDNS for Services on IBMCloud
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Setting up ExternalDNS for Infoblox
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Configuring ExternalDNS to use the Istio Gateway and/or Istio Virtual Service Source
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Configuring ExternalDNS to use the Kong TCPIngress Source
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kOps dns-controller compatibility mode
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Using ExternalDNS with kube-ingress-aws-controller
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Setting up ExternalDNS for Services on Linode
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Setting up ExternalDNS on GKE with nginx-ingress-controller
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Configuring ExternalDNS to use Cluster Nodes as Source
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Creating NS record with CRD source
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Setting up ExternalDNS for Services on NS1
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Configuring ExternalDNS to use the OpenShift Route Source
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Setting up ExternalDNS for Oracle Cloud Infrastructure (OCI)
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Setting up ExternalDNS for Services on OVH
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Setting up ExternalDNS for PowerDNS
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Setting up ExternalDNS for Services on Plural
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Setting up ExternalDNS using the same domain for public and private Route53 zones
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Setting up ExternalDNS for Services on RcodeZero
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Setting up ExternalDNS for RancherDNS(RDNS) with kubernetes
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Configuring RFC2136 provider
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Setting up ExternalDNS for Services on Scaleway
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Running ExternalDNS with limited privileges
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Setting up ExternalDNS for Tencent Cloud
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Setting up ExternalDNS for Services on TransIP
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Setting up ExternalDNS for Services on UltraDNS
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Setting up ExternalDNS for VinylDNS
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<h1 id="using-externaldns-with-alb-ingress-controller">Using ExternalDNS with alb-ingress-controller<a class="headerlink" href="#using-externaldns-with-alb-ingress-controller" title="Permanent link">&para;</a></h1>
<p>This tutorial describes how to use ExternalDNS with the <a href="https://kubernetes-sigs.github.io/aws-load-balancer-controller">aws-alb-ingress-controller</a>.</p>
<h2 id="setting-up-externaldns-and-aws-alb-ingress-controller">Setting up ExternalDNS and aws-alb-ingress-controller<a class="headerlink" href="#setting-up-externaldns-and-aws-alb-ingress-controller" title="Permanent link">&para;</a></h2>
<p>Follow the <a href="../aws/">AWS tutorial</a> to setup ExternalDNS for use in Kubernetes clusters<br />
running in AWS. Specify the <code>source=ingress</code> argument so that ExternalDNS will look<br />
for hostnames in Ingress objects. In addition, you may wish to limit which Ingress<br />
objects are used as an ExternalDNS source via the <code>ingress-class</code> argument, but<br />
this is not required.</p>
<p>For help setting up the ALB Ingress Controller, follow the <a href="https://kubernetes-sigs.github.io/aws-load-balancer-controller/latest/deploy/installation/">Setup Guide</a>.</p>
<p>Note that the ALB ingress controller uses the same tags for <a href="https://kubernetes-sigs.github.io/aws-load-balancer-controller/latest/deploy/subnet_discovery/">subnet auto-discovery</a><br />
as Kubernetes does with the AWS cloud provider.</p>
<p>In the examples that follow, it is assumed that you configured the ALB Ingress<br />
Controller with the <code>ingress-class=alb</code> argument (not to be confused with the<br />
same argument to ExternalDNS) so that the controller will only respect Ingress<br />
objects with the <code>kubernetes.io/ingress.class</code> annotation set to &ldquo;alb&rdquo;.</p>
<h2 id="deploy-an-example-application">Deploy an example application<a class="headerlink" href="#deploy-an-example-application" title="Permanent link">&para;</a></h2>
<p>Create the following sample &ldquo;echoserver&rdquo; application to demonstrate how<br />
ExternalDNS works with ALB ingress objects.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">apps/v1</span><span class="w"></span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Deployment</span><span class="w"></span>
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="nt">metadata</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">echoserver</span><span class="w"></span>
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="nt">spec</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="w"> </span><span class="nt">replicas</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1</span><span class="w"></span>
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="w"> </span><span class="nt">selector</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="w"> </span><span class="nt">matchLabels</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="w"> </span><span class="nt">app</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">echoserver</span><span class="w"></span>
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="w"> </span><span class="nt">template</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="w"> </span><span class="nt">metadata</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="w"> </span><span class="nt">labels</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a><span class="w"> </span><span class="nt">app</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">echoserver</span><span class="w"></span>
<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a><span class="w"> </span><span class="nt">spec</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a><span class="w"> </span><span class="nt">containers</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">gcr.io/google_containers/echoserver:1.4</span><span class="w"></span>
<a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a><span class="w"> </span><span class="nt">imagePullPolicy</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Always</span><span class="w"></span>
<a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">echoserver</span><span class="w"></span>
<a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a><span class="w"> </span><span class="nt">ports</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">containerPort</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">8080</span><span class="w"></span>
<a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></a><span class="nn">---</span><span class="w"></span>
<a id="__codelineno-0-22" name="__codelineno-0-22" href="#__codelineno-0-22"></a><span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">v1</span><span class="w"></span>
<a id="__codelineno-0-23" name="__codelineno-0-23" href="#__codelineno-0-23"></a><span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Service</span><span class="w"></span>
<a id="__codelineno-0-24" name="__codelineno-0-24" href="#__codelineno-0-24"></a><span class="nt">metadata</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-0-25" name="__codelineno-0-25" href="#__codelineno-0-25"></a><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">echoserver</span><span class="w"></span>
<a id="__codelineno-0-26" name="__codelineno-0-26" href="#__codelineno-0-26"></a><span class="nt">spec</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-0-27" name="__codelineno-0-27" href="#__codelineno-0-27"></a><span class="w"> </span><span class="nt">ports</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-0-28" name="__codelineno-0-28" href="#__codelineno-0-28"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">port</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">80</span><span class="w"></span>
<a id="__codelineno-0-29" name="__codelineno-0-29" href="#__codelineno-0-29"></a><span class="w"> </span><span class="nt">targetPort</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">8080</span><span class="w"></span>
<a id="__codelineno-0-30" name="__codelineno-0-30" href="#__codelineno-0-30"></a><span class="w"> </span><span class="nt">protocol</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">TCP</span><span class="w"></span>
<a id="__codelineno-0-31" name="__codelineno-0-31" href="#__codelineno-0-31"></a><span class="w"> </span><span class="nt">type</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">NodePort</span><span class="w"></span>
<a id="__codelineno-0-32" name="__codelineno-0-32" href="#__codelineno-0-32"></a><span class="w"> </span><span class="nt">selector</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-0-33" name="__codelineno-0-33" href="#__codelineno-0-33"></a><span class="w"> </span><span class="nt">app</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">echoserver</span><span class="w"></span>
</code></pre></div>
<p>Note that the Service object is of type <code>NodePort</code>. We don&rsquo;t need a Service of<br />
type <code>LoadBalancer</code> here, since we will be using an Ingress to create an ALB.</p>
<h2 id="ingress-examples">Ingress examples<a class="headerlink" href="#ingress-examples" title="Permanent link">&para;</a></h2>
<p>Create the following Ingress to expose the echoserver application to the Internet.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">networking.k8s.io/v1</span><span class="w"></span>
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Ingress</span><span class="w"></span>
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="nt">metadata</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="w"> </span><span class="nt">annotations</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="w"> </span><span class="nt">alb.ingress.kubernetes.io/scheme</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">internet-facing</span><span class="w"></span>
<a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="w"> </span><span class="nt">kubernetes.io/ingress.class</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">alb</span><span class="w"></span>
<a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">echoserver</span><span class="w"></span>
<a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="nt">spec</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a><span class="w"> </span><span class="nt">ingressClassName</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">alb</span><span class="w"></span>
<a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a><span class="w"> </span><span class="nt">rules</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">host</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">echoserver.mycluster.example.org</span><span class="w"></span>
<a id="__codelineno-1-12" name="__codelineno-1-12" href="#__codelineno-1-12"></a><span class="w"> </span><span class="nt">http</span><span class="p">:</span><span class="w"> </span><span class="nl">&amp;echoserver_root</span><span class="w"></span>
<a id="__codelineno-1-13" name="__codelineno-1-13" href="#__codelineno-1-13"></a><span class="w"> </span><span class="nt">paths</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-1-14" name="__codelineno-1-14" href="#__codelineno-1-14"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">path</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">/</span><span class="w"></span>
<a id="__codelineno-1-15" name="__codelineno-1-15" href="#__codelineno-1-15"></a><span class="w"> </span><span class="nt">backend</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-1-16" name="__codelineno-1-16" href="#__codelineno-1-16"></a><span class="w"> </span><span class="nt">service</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-1-17" name="__codelineno-1-17" href="#__codelineno-1-17"></a><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">echoserver</span><span class="w"></span>
<a id="__codelineno-1-18" name="__codelineno-1-18" href="#__codelineno-1-18"></a><span class="w"> </span><span class="nt">port</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-1-19" name="__codelineno-1-19" href="#__codelineno-1-19"></a><span class="w"> </span><span class="nt">number</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">80</span><span class="w"></span>
<a id="__codelineno-1-20" name="__codelineno-1-20" href="#__codelineno-1-20"></a><span class="w"> </span><span class="nt">pathType</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Prefix</span><span class="w"></span>
<a id="__codelineno-1-21" name="__codelineno-1-21" href="#__codelineno-1-21"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">host</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">echoserver.example.org</span><span class="w"></span>
<a id="__codelineno-1-22" name="__codelineno-1-22" href="#__codelineno-1-22"></a><span class="w"> </span><span class="nt">http</span><span class="p">:</span><span class="w"> </span><span class="nv">*echoserver_root</span><span class="w"></span>
</code></pre></div>
<p>The above should result in the creation of an (ipv4) ALB in AWS which will forward<br />
traffic to the echoserver application.</p>
<p>If the <code>source=ingress</code> argument is specified, then ExternalDNS will create DNS<br />
records based on the hosts specified in ingress objects. The above example would<br />
result in two alias records being created, <code>echoserver.mycluster.example.org</code> and<br />
<code>echoserver.example.org</code>, which both alias the ALB that is associated with the<br />
Ingress object.</p>
<p>Note that the above example makes use of the YAML anchor feature to avoid having<br />
to repeat the http section for multiple hosts that use the exact same paths. If<br />
this Ingress object will only be fronting one backend Service, we might instead<br />
create the following:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">networking.k8s.io/v1</span><span class="w"></span>
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Ingress</span><span class="w"></span>
<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="nt">metadata</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="w"> </span><span class="nt">annotations</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="w"> </span><span class="nt">alb.ingress.kubernetes.io/scheme</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">internet-facing</span><span class="w"></span>
<a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="w"> </span><span class="nt">external-dns.alpha.kubernetes.io/hostname</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">echoserver.mycluster.example.org, echoserver.example.org</span><span class="w"></span>
<a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a><span class="w"> </span><span class="nt">kubernetes.io/ingress.class</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">alb</span><span class="w"></span>
<a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">echoserver</span><span class="w"></span>
<a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a><span class="nt">spec</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a><span class="w"> </span><span class="nt">ingressClassName</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">alb</span><span class="w"></span>
<a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a><span class="w"> </span><span class="nt">rules</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">http</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a><span class="w"> </span><span class="nt">paths</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-2-14" name="__codelineno-2-14" href="#__codelineno-2-14"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">path</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">/</span><span class="w"></span>
<a id="__codelineno-2-15" name="__codelineno-2-15" href="#__codelineno-2-15"></a><span class="w"> </span><span class="nt">backend</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-2-16" name="__codelineno-2-16" href="#__codelineno-2-16"></a><span class="w"> </span><span class="nt">service</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-2-17" name="__codelineno-2-17" href="#__codelineno-2-17"></a><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">echoserver</span><span class="w"></span>
<a id="__codelineno-2-18" name="__codelineno-2-18" href="#__codelineno-2-18"></a><span class="w"> </span><span class="nt">port</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-2-19" name="__codelineno-2-19" href="#__codelineno-2-19"></a><span class="w"> </span><span class="nt">number</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">80</span><span class="w"></span>
<a id="__codelineno-2-20" name="__codelineno-2-20" href="#__codelineno-2-20"></a><span class="w"> </span><span class="nt">pathType</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Prefix</span><span class="w"></span>
</code></pre></div>
<p>In the above example we create a default path that works for any hostname, and<br />
make use of the <code>external-dns.alpha.kubernetes.io/hostname</code> annotation to create<br />
multiple aliases for the resulting ALB.</p>
<h2 id="dualstack-albs">Dualstack ALBs<a class="headerlink" href="#dualstack-albs" title="Permanent link">&para;</a></h2>
<p>AWS <a href="https://docs.aws.amazon.com/elasticloadbalancing/latest/application/application-load-balancers.html#ip-address-type">supports</a> both IPv4 and &ldquo;dualstack&rdquo; (both IPv4 and IPv6) interfaces for ALBs.<br />
The ALB ingress controller uses the <code>alb.ingress.kubernetes.io/ip-address-type</code><br />
annotation (which defaults to <code>ipv4</code>) to determine this. If this annotation is<br />
set to <code>dualstack</code> then ExternalDNS will create two alias records (one A record<br />
and one AAAA record) for each hostname associated with the Ingress object.</p>
<p>Example:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">networking.k8s.io/v1</span><span class="w"></span>
<a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Ingress</span><span class="w"></span>
<a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="nt">metadata</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="w"> </span><span class="nt">annotations</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="w"> </span><span class="nt">alb.ingress.kubernetes.io/scheme</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">internet-facing</span><span class="w"></span>
<a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a><span class="w"> </span><span class="nt">alb.ingress.kubernetes.io/ip-address-type</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">dualstack</span><span class="w"></span>
<a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a><span class="w"> </span><span class="nt">kubernetes.io/ingress.class</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">alb</span><span class="w"></span>
<a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">echoserver</span><span class="w"></span>
<a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a><span class="nt">spec</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-3-10" name="__codelineno-3-10" href="#__codelineno-3-10"></a><span class="w"> </span><span class="nt">ingressClassName</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">alb</span><span class="w"></span>
<a id="__codelineno-3-11" name="__codelineno-3-11" href="#__codelineno-3-11"></a><span class="w"> </span><span class="nt">rules</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-3-12" name="__codelineno-3-12" href="#__codelineno-3-12"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">host</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">echoserver.example.org</span><span class="w"></span>
<a id="__codelineno-3-13" name="__codelineno-3-13" href="#__codelineno-3-13"></a><span class="w"> </span><span class="nt">http</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-3-14" name="__codelineno-3-14" href="#__codelineno-3-14"></a><span class="w"> </span><span class="nt">paths</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-3-15" name="__codelineno-3-15" href="#__codelineno-3-15"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">path</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">/</span><span class="w"></span>
<a id="__codelineno-3-16" name="__codelineno-3-16" href="#__codelineno-3-16"></a><span class="w"> </span><span class="nt">backend</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-3-17" name="__codelineno-3-17" href="#__codelineno-3-17"></a><span class="w"> </span><span class="nt">service</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-3-18" name="__codelineno-3-18" href="#__codelineno-3-18"></a><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">echoserver</span><span class="w"></span>
<a id="__codelineno-3-19" name="__codelineno-3-19" href="#__codelineno-3-19"></a><span class="w"> </span><span class="nt">port</span><span class="p">:</span><span class="w"></span>
<a id="__codelineno-3-20" name="__codelineno-3-20" href="#__codelineno-3-20"></a><span class="w"> </span><span class="nt">number</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">80</span><span class="w"></span>
<a id="__codelineno-3-21" name="__codelineno-3-21" href="#__codelineno-3-21"></a><span class="w"> </span><span class="nt">pathType</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Prefix</span><span class="w"></span>
</code></pre></div>
<p>The above Ingress object will result in the creation of an ALB with a dualstack<br />
interface. ExternalDNS will create both an A <code>echoserver.example.org</code> record and<br />
an AAAA record of the same name, that each are aliases for the same ALB.</p>
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